[raffraffraff]

Many years ago I joined a bootcamp. Military style training for civilians. All they did was push us pretty hard for 50 minutes, do 10 minutes of good stretching and let us go. Two days per week, and it changed my life. I from being slightly underweight and unfit to "really fit" within 6 months. I would take on anything. 100km cycles, 15km runs. So when I switched jobs and my new office was 10km away from home I made running my commute two days per week.

The training was all outdoors, in city parks. It was a mix of intervals (jog/sprint) and body weight exercises (squat, pushup, lunge, plank and side-plank). Depending on the props they brought we might also be dragging tires around or lifting stuff, but not often. They'd also include "fun" stuff too (stupid games). What kept me at it was actually the social thing. Once your get to know the people in your group, they know if you don't show up. I went in lashing rain and snow. Kept it up for a few years.

I don't know if you can find anything like that, but if you can, I recommend it.